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Sustained sleep deprivation impairs host defense
1Clinical Psychobiology Branch, National Institute of Mental Health, Bethesda, Maryland 20892.
Abstract:
Prolonged sleep deprivation in rats causes an unexplained hypercatabolic state, secondary malnutrition symptoms, and mortality. The nature of the vital impairment has long been a mystery. Its determination would help to elucidate the type of organic dysfunction that sleep prevents. There are no gross detectable disturbances in intermediary metabolism, clinical chemistry, or hematological indexes that provide substantial clues to the mediation of sleep-deprivation effects. Furthermore, postmortem examinations reveal no systematic morphological or histopathological findings. Taken together, the cachexia and the absence of evidence of structural damage or organ dysfunction pointed to involvement of a regulatory system that was diffuse, possibly the immune system. Blood cultures revealed invasion by opportunistic microbes to which there was no febrile response. These results suggest that the life-threatening condition of prolonged sleep deprivation is a breakdown of host defense against indigenous and pathogenic microorganisms.
Insights
Prolonged sleep deprivation in rats leads to a hypercatabolic state and mortality. This study reveals it
Area of Science:
- Neuroscience
- Immunology
- Physiology
Background:
- Prolonged sleep deprivation in rats induces a hypercatabolic state, malnutrition, and mortality.
- The underlying cause of this vital impairment remains largely unknown.
- Previous investigations found no significant metabolic, clinical, or hematological abnormalities.
Purpose of the Study:
- To determine the nature of the vital impairment caused by prolonged sleep deprivation.
- To elucidate the organic dysfunction that sleep normally prevents.
- To investigate the potential role of the immune system in sleep deprivation-induced mortality.
Main Methods:
- Rats were subjected to prolonged sleep deprivation.
- Comprehensive analyses of intermediary metabolism, clinical chemistry, and hematology were performed.
- Postmortem examinations, including morphological and histopathological assessments, were conducted.
- Blood cultures were analyzed for microbial invasion.
Main Results:
- No gross disturbances in metabolism, clinical chemistry, or hematology were detected.
- Postmortem examinations showed no systematic morphological or histopathological findings.
- Blood cultures revealed invasion by opportunistic microbes without a febrile response.
- Cachexia was observed in the absence of structural organ damage.
Conclusions:
- The findings suggest a breakdown in host defense mechanisms against microorganisms.
- Prolonged sleep deprivation appears to compromise the immune system's ability to combat infections.
- This immune system failure is implicated as the cause of mortality in sleep-deprived rats.